高中英语人教版高二上11

[05:49.81]and are no longer safe for swimming,
[05:53.75]as a lot of diseases are present in the water.
[05:58.19]In most places it is not safe to eat the fish.
[06:03.26]Lakes also have the same problems.
[06:07.31]Lake Baikal in Asia was once the cleanest in the world,
[06:12.66]with over 700 different kinds of plant and animal life.
[06:18.54]Now,however,the waters of this great lake,
[06:23.58]which is also the world's deepest (over 1,740 metres),
[06:31.05]have been dirtied by waste from a chemical factory.
[06:36.02]In 1989 an oil tanker hit a rock off the northwest coast of Alaska.
[06:43.77]35,000 tons of oil poured into the sea.
[06:49.34]The accident was one of the worst in history.
[06:53.88]More than 34,000 birds and 10,000 animals were killed.
[07:00.65]4,800 square kilometres of ocean were polluted.
[07:06.81]Lesson 35
[07:14.96]1.Reading comprehension
[07:19.54]ANIMALS IN DANGER
[07:23.01]Three billion years after life began,
[07:27.56]the earth is now the home to many different kinds of living things
[07:33.12]- perhaps five to ten million kinds.
[07:37.27]However,many of these are dying out.
[07:41.64]It is thought that between the years 1550 and 1950
[07:47.83]an average of one kind of living thing died out each year.
[07:53.39]By 1985 this had risen to one per day.
[07:58.85]Between 1980 and 2010
[08:03.60]we may lose another half a million different kinds of living things.
[08:09.46]There are many reasons for animals dying out,
[08:13.92]but the most important one is the part that humans have played.
[08:19.49]First,many animals have been killed for food.
[08:24.35]Second,many of the places where these animals used to live have been destroyed.
[08:31.11]Dry lands have been watered.
[08:34.59]Wet lands have been turned into fields.
[08:38.84]Forests have been cleared.
[08:42.19]Much land has either been changed to farmland or used for building.
[08:48.14]Polluted rivers and lakes have also been a cause of death.
[08:53.50]One exaple of an animal in danger is the tiger.
[08:58.46]There are three types of tiger living in China:
[09:02.72]the South China,the Northeastern,and the Bengal.
[09:07.89]In all there are probably no more than a total of 400 tigers left in China.
[09:14.95]Many of the forests where they lived were destroyed.
[09:19.49]Also,tigers were hunted and killed
[09:23.75]until in many areas the entire population had disappeared.
[09:29.39]In 1900 there were about 100,000 tigers in Asia.
[09:35.66]In 1970 when the shooting of tigers was stopped there were just 5,000 left.
[09:43.11]In India,however,the population of tigers has increased,
[09:48.67]from 2,000 in 1972 to about 5,000 in 1989.
[09:56.04]Perhaps the same progress can be made in China.
[10:01.00]3.Reading comprehension
[10:05.26]Read the text and mark all the past participles which you can find in it.
[10:11.32]A DAY IN THE FOREST
[10:14.48]Last Monday our class went on an organized trip to a forest to study the wildlife.
[10:21.92]We travelled by bus.It took us two and a half hours to get to the forest.
[10:28.69]When we arrived,we were given printed question papers.
[10:34.02]We had to fill in the answers in our notebooks.
[10:38.48]The purpose of the trip
[10:41.54]was to record all the wildlife and plants that we could find in the forest.
[10:47.78]Whenever we found an unknown plant,we wrote "unknown" in our notebooks.
[10:53.95]If none of us knew the name of the plant,we wrote "unknown" in our notebooks.
[11:00.92]The gate into the forest was open,so we entered it.
[11:05.68]We all started looking for new types of plant.
[11:09.83]Sun Yao,our monitor and I remembered a programme that a well-known
[11:15.89]film direcor had made about the forest.
[11:20.15]She had shown pictures of a plant that had recently been discovered.
[11:25.61]She had not said,however,where it could be found.
[11:30.47]She said it was a well-kept secret.
[11:34.31]We decided to try and find this plant.
[11:38.57]We had our picnic lunch in the forest next to a fallen tree.
[11:43.92]After lunch we put some water into a bottle